O - *1 W POLYCHLORINATED BIPHENYLS fPC3) - -- 2G2 * Polychlorinated biphenyls (PCB)' consist' of mixture of jtgpounds only slightly soluble In water; highly soluble In fats, oils, nonpolar liquids; and highly resistant to both heat and biological {gradation.

_ Residues of Organochlorine Pesticides and Polychlorinated Biphenyls and Autopsy Data for Bald Eagles', 1971-72' Eugene Cromanie, William L.

atfttia MM Tightening up on VCM Tops in chemical industry A "no detectable level" standard for exposure to vinyl chloride monomer Employees' and proprietors' earnings ... more and more in '74 (VCM) in the workplace was recom in chemical industry* mended last week by the Labor Dept's.

INTERNAL COr^E5PONDNC GULF 10973 - A FROM TO Dr.

When this occurs another pathway(s) become operant and ultimately form reactive metabolites which react with macromolecules leading to the development of cancer.

water to form a dope Asbestos is included in these for- of the hydroxyethyl cellulose used If the M.S. of the mulations for several purposes It imparts lubricity work- 40 hydroxyethyl cellulose is in the range of 0.15 to 0.6 the ability water binding and pseudoplasticity to the wet mix concentration employed can be in the range of % to and being fibrous provides reinforcement of the cement % based on the dry weight of the formulation Due to on drying 4 the superior binding capacity of the cellulose de- Recently disclosed evidence that certain types of as- rivative having an M.S. in the range of 0.6 to 1.2 the bestos may have carcinogenic characteristics has prompted 45 concentration of the additive which is effective can be issuance of severely restrictive regulations by OSHA re- about 0.5 to 1.5 based on the total dry weight of the garding its use in construction applications and may even- formulation Thus the concentration of the additive can tually lead to its being banned altogether For this rea- be about 0.5 to % based on the total dry weight of the son an effort is now under way to find substitutes to formulation Employing conventional joint cement recipes place asbestos in most of its present applications re- 50 the additional weight of asbestos not replaced by cellulose In recent work by the instant inventor it has been derivative is replaced by additional limestone or mica found that cellulose derivatives can be used so that the total weight of product remains the same ment for asbestos in joint cement More as a replace- As suggested previously it is important that the hy- invention relates to specifically this droxyethyl cellulose be in fibrous form For best results joint cement compositions based on 55 the fiber length should be between about 0.03 and 0.007 a resinous binder mica clay and limestone as major dry inch If the fiber length becomes too components along with a fibrous insoluble hy- cement composition is curdy and great the resulting droxyethyl cellulose having an M.S. between about 0.15 not satisfactory On the other hand if the fibrous form and 1.4 Joint cements are maketed in is lacking the water- fully formulated ready form i.e. already containing binding capacity of the hydroxyethyl cellulose is not suf- water and as 60 ficient to reproduce the properties of conventional joint a dry powder to which water is added at the time of use cements The invention includes such dry powders as well as the fully formulated cements Joint cement In some cases the hydroxethyl cellulose alone can give this invention compositions of the composition sufficient body for application to a vertical are substantially identical in performance wall without sagging or down In other to those which are presently available commercially and 65 structure additive can be added to increase cases a based on current price levels they are competitive in the level the body to price necessary Materials useful as structure addi- In commercial practice the concentrations tives for this purpose include e.g. cellulose fibers in cipal ingredients can and do of the prin- various forms treated clays and porous stone flour When vary widely between suppliers and depending on the intended structure additives of this type are added they normally it is for end use i.e. whether replace a portion of one of the inert fillers i.e. limestone patching holes covering nail pops or for initially mica or clay 3,835,074 3 4 The resinous binder is normally a coalescable vinyl The latex binder was a 55 by weight aqueous disper- material preferably vinyl acetate which upon dry- sion of vinyl acetate containing a plasticizer The ing or curing of the cement forms a thin matrix to hold the clay limestone etc.

Some samplee were cleaned-up on an alualna-microcoluan, uelng 2}t 12 and 50jt methylenechlorlde in n-hexane to separately elute PCBe and PCDFb, Analyees were carried out on a Finnigan 4000 quadrupole GC-KS Instrument equipped with elsotron-lmpaot ion-source and a Finnigan Gill data-Byetea, OV-17 glass oapillary columns of 25 and 50 a length (0,36 mm IP) were coupled via a platinum Interface leading directly Into the Ion-source, The oolumn conditions were as follows) 100, 2 sin Isothermal, 15/"ln to 145, 5/mln to 230C for the 25 OV-17 column; 100, 2 min leothermal, 20/mln to 160, 2/min to 230 for the 50 OV-17 column; helium carrier gae at 0,60 and 1-40 at, reepec- .o tlvely.

, ... 1 _ _ _ _. . . . . . _ . . _ ' - - - - - - - - - - - - - - - - - -. . . . . . . _ . _ . . , _ _ _ _ _ _ p _ _ . . . _ _ . _ , _ _ . . . . . _ ..... -~-----------...._ _ _ _ - -.. .... - ASBEsros I~TERNAT'IONAL AssocrATroJAN 31980 (Limited by Guaranh:e) 68 GLOUCI~STf:R l'I.ACl-:, LONDON \VrH 3HL, El'\Gl..AND Tclcplwue: 01-1&6 :;;:;-~8/9 Tcleer;um; lntag l..

A year when the admonition "lead, follow, or get the hell out of the way" must be the way of doing busi ness, not just an off the cuff quip.

F - Pc p thick, and oriented parallel to (010) wan pre pared from the olivine crystal (composition de termined by microprobe analysis).

MONSANTO'S PCB PROGRAM W.

(Pedricktown has run a similar evaluation of paired sampling for their paste-pearl building -- leading to paired sampling for the Bendlx.

* fl" ; CO.

When this occurs another pathway(s) become operant and ultimately form reactive metabolites which react with macromolecules leading to the development of cancer.

BACK TO MAIN Centre Analytical Laboratories, Inc. 3048 Research Drive State College, PA 16801 www.centrelab.com ^P hone: (814)231-8032 Fax: (814) 231-1253or (814) 231-1580 Analytical Report Fluorochemical Characterization of Surface Water Samples Cleveland, Tennessee (W1973) Centre Analytical Laboratory Report No. 023-014A (Revision 1) Revision Date 3/21/01 Testing Laboratory Centre Analytical Laboratory, Inc. 3048 Research Drive State College, PA 16801 3M Environmental Laboratory Contact Kent R.